The highest concentration of cones is in the:
a. fovea
b. blind spot
c. sclera
d. ommatidium
e. choroid
a
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A ___ is a chemical that is released by one animal that affects the physiology and or behavior of another member of the same species.
A) neurotransmitter B) neurochemical C) hormone D) pheromone
Chorionic villi eventually become the placenta
Indicate whether the statement is true or false.
Bacteria are grown in 15N (heavy) medium and then transferred to 14N (light) medium and are allowed to replicate for one generation. The DNA is subsequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?
A. one heavy and one half-heavy band B. one heavy and one light band C. one light band D. one half-heavy (intermediate to heavy and light) band E. one heavy band
Which of the following may form one colony?
A. A short chain of bacteria B. A single bacterial cell C. A small clump of bacteria D. All of the choices are correct.